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We show experimentally that the presence of correlated photon pairs generated by Four Wave Mixing in Raman fiber lasers significantly increase the efficiency of spectrum compression of continuous-wave multimode waves propagating in normal dispersion fiber.
It was shown that the spectral width of a nominally continuous wave Raman fiber laser (RFL) output becomes narrower after propagation in normal dispersion (β2>0) fiber [1]. This feature, attributed to Inverse Four-Wave Mixing (IFWM), was especially pronounced when the RFL output had a double-peak spectral shape caused by efficient FWM inside the cavity [2]. This spectrum was transformed into a...
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